Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 37
ame as those givenin modern books on geography, except the reasonwhich might be expected to convince even the leastreflective, namely, that people have been round it andnearly all over it. Eratosthenes, the librarian at Alex-andria, who lived from 276 to 196 B.C., first determinedits size. He… … Taking the Sun to be at a distance so much greaterthan the distance AS, Diagram XII, that the lines from A and S to the Sun areparallel, the angle AOS be-tween the verticals at the twoplaces is 7^°. Thus AS :Circumference of Earth =7i°:36o°=i: 50. The distance between Syene and Alexandria was…
Astronomy
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